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2006 IFIP International Conference on Wireless and Optical Communications Networks最新文献

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SIP as an enabler for convergence in future wireless communication networks SIP是未来无线通信网络融合的推动者
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666595
V.C. Joseph, K.K. Lucky, G.N.S. Mohan Rao
{"title":"SIP as an enabler for convergence in future wireless communication networks","authors":"V.C. Joseph, K.K. Lucky, G.N.S. Mohan Rao","doi":"10.1109/WOCN.2006.1666595","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666595","url":null,"abstract":"The session initiation protocol (SIP) is the IETF signaling protocol for VoIP (voice over Internet protocol) and other text and multimedia sessions. 3GPP has begun the evolution to \"all IP access\" with the introduction of MSC Server-SGSN split in Release 4 and subsequent introduction of the IP multimedia sub-system (IMS) in Release 5 and 6. The long term evolution of 3GPP strives to achieve seamless mobility with the evolved-RAN (E-UTRAN) and inter-working with multiple access technologies over the common core network based on IP-all IP access network (AIPN). The arrival of mobility in the broadband systems such as 802.16e and 802.20 has propelled the industry trend towards ubiquity and seamless mobility irrespective of the access technology. SIP works as an application layer signaling protocol over the IMS infrastructure to facilitate convergence between the broadband providers and wireless carriers. This paper delivers the convergence model for inter-working and handovers using SIP over the IMS infrastructure. We propose the enhancement of SIP towards real-time conversational multimedia session transfer to realize the full potential of all IP access networks","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126010184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Using WEP in ad-hoc networks 在自组织网络中使用WEP
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666575
Vincent Guyot
{"title":"Using WEP in ad-hoc networks","authors":"Vincent Guyot","doi":"10.1109/WOCN.2006.1666575","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666575","url":null,"abstract":"Nowadays, with the normalization of the 802.11 standard and the emerging of Wi-Fi low cost devices, many testbeds use this wireless technology to realize ad-hoc networks. The 802.11 security protocol, WEP, has not been designed by security experts. It results in a flawed protocol. The secret key shared between all 802.11 devices can be retrieved by attackers which are passively collecting data over the wireless network. TKIP, which solves this problem by periodically refreshing the keys between the access points and the wireless clients, has been standardized. But 802.11 ad-hoc networks remain unsafe. We address the problem of security in ad-hoc environments by using smart cards to handle the actual WEP-based 802.11 networking adapters to refresh the WEP key, like TKIP does in infrastructure environments","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116121701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Performance analysis of multiple antennas BS and single antenna MS link of mobile cellular network 移动蜂窝网络多天线BS和单天线MS链路性能分析
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666611
S. Karim, I. Islam, A. Hossain
{"title":"Performance analysis of multiple antennas BS and single antenna MS link of mobile cellular network","authors":"S. Karim, I. Islam, A. Hossain","doi":"10.1109/WOCN.2006.1666611","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666611","url":null,"abstract":"In this paper array antenna concept along with symbol coding is applied at base station (BS) side to enhance channel capacity of a mobile cellular network keeping single antenna at mobile station (MS) side. Using this scheme, performance of a wireless network could be improved considerably within the limited dynamic range of transmitter. The performance improvement is achieved without any channel knowledge prior transmission","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128103161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An efficient approach to data hiding based on lattice vector quantization 一种基于点阵矢量量化的有效数据隐藏方法
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666681
K. Nallaperumal, R. Selvakumar, S. Radhakrishnan, K. Arulmozhi, J. Varghese, K. Krishnaveni
{"title":"An efficient approach to data hiding based on lattice vector quantization","authors":"K. Nallaperumal, R. Selvakumar, S. Radhakrishnan, K. Arulmozhi, J. Varghese, K. Krishnaveni","doi":"10.1109/WOCN.2006.1666681","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666681","url":null,"abstract":"This paper describes a robust, oblivious data embedding scheme which uses lattice vector quantization. The embedding is done in the DCT domain. The signature image is vector quantized and the indices obtained are coded using error-correcting codes (BCH codes). The codewords obtained are multiplied by a scaling factor and perturbed into the DCT coefficients of the host image which is lattice vector quantized. Experimental results of the peak signal to noise ratio (PSNR) of the watermarked image for different host images and the PSNR of the recovered signature image for different values of scaling factors stand a testimony for the validity of this method","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130715308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Enhanced proportional fair scheduling for cdma2000 1x EV-DO reverse link cdma2000 1x EV-DO反向链路的增强比例公平调度
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666535
Wang Xiaoyi, Qu Yajiang
{"title":"Enhanced proportional fair scheduling for cdma2000 1x EV-DO reverse link","authors":"Wang Xiaoyi, Qu Yajiang","doi":"10.1109/WOCN.2006.1666535","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666535","url":null,"abstract":"cdma2000 Ix EV-DO Rev.A reverse link adopts dynamic transmission rate technique which allows efficient data transmission with variable data rate according to the channel conditions and system load. Because in reverse link (RL), a higher data rate means a stronger interference, the algorithm of allocating data rate to AT (access terminal) is critical to an interference limited wireless system. Currently, proportional fair scheduling is adopted in cdma2000 1x EV-DO Rev. A forward link, which can make a degree of balance between fairness and throughput. However, it doesn't suit for reverse link. This paper gives an enhanced proportional fair algorithm for reverse link. And simulation results are present to demonstrate the impact of new algorithm","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127999441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An approach to reduce four-wave mixing effect on existing G.653 fibers for WDM applications WDM应用中减少现有G.653光纤四波混频效应的方法
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666637
S. Prakash Singh, S. Kar, V. Jain
{"title":"An approach to reduce four-wave mixing effect on existing G.653 fibers for WDM applications","authors":"S. Prakash Singh, S. Kar, V. Jain","doi":"10.1109/WOCN.2006.1666637","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666637","url":null,"abstract":"Four-wave mixing (FWM) is a dominant non-linear effect present in wavelength division multiplexing (WDM) networks employing dispersion shifted fiber (i.e., G.653 compliant fiber). To reduce the number of FWM components generated, unequally spaced channel allocation scheme is used. However, it results in increased bandwidth. To overcome this problem, modified periodically unequally spaced channel allocation (PUSCA) scheme can be used which results in fewer FWM components and efficient bandwidth utilization. To further reduce the number of FWM components, paired PUSCA method can be employed. In this paper, a comparative study of both the methods has been made. A figure of merit, defined as the ratio of increase in weighted average signal to FWM noise ratio to increase in bandwidth for a given scheme has been used as a metric of performance. Further, the performance of paired PUSCA scheme on G.653 fiber has been compared with equally spaced channel allocation (ESCA) scheme on G.652 fiber in which FWM is not a dominant non-linear effect. It has been observed that paired PUSCA on G.653 fiber performs better than ESCA on G.652 fiber when the number of channels is less than 30","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131287363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Ultra-wideband interference mitigation using cross-layer cognitive radio 使用跨层认知无线电的超宽带干扰缓解
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666533
R. Saeed, S. Khatun, B. Ali, M. Abdullah
{"title":"Ultra-wideband interference mitigation using cross-layer cognitive radio","authors":"R. Saeed, S. Khatun, B. Ali, M. Abdullah","doi":"10.1109/WOCN.2006.1666533","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666533","url":null,"abstract":"Cognitive Radio (CR) is an emerging approach for a more efficient usage of the precious radio spectrum resources, which it considers an expanded view of the wireless channel by managing and adapting various dimensions of time, frequency, space, power, and coding. In this paper, we define the system requirements for cognitive radio, as well as the general architecture and basic physical and link layer functions. In order to self-adapt the UWB pulse shape parameters and maximize system capacity while co-exist with in-band legacy NB systems (WiFi and FWA) in the surrounding environments","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125603904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Routing and wavelength assignment in WDM optical networks WDM光网络中的路由和波长分配
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666636
Paramjeet Singh, Ajay K Sharma, S. Rani, Surinder Singh
{"title":"Routing and wavelength assignment in WDM optical networks","authors":"Paramjeet Singh, Ajay K Sharma, S. Rani, Surinder Singh","doi":"10.1109/WOCN.2006.1666636","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666636","url":null,"abstract":"Routing and wavelength assignment (RWA) is the problem to select a suitable path and wavelength among the many possible choices for each connection such that no two paths using the same wavelength pass through the same link. In wavelength division multiplexing (WDM) optical networks, there is a need to maximize the number of connections established and to minimize the blocking probability using limited resources. This paper presents efficient RWA strategies, which minimizes the blocking probability. Simulation results show that the performance of the proposed strategies is much better than the existing strategy","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129274415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Noncoherent UWB-PPM receiver with multiple sub-intervals selective integration optimization 多子间隔非相干UWB-PPM接收机选择积分优化
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666631
Jianjun Wu, Qinglin Liang, Haige Xiang
{"title":"Noncoherent UWB-PPM receiver with multiple sub-intervals selective integration optimization","authors":"Jianjun Wu, Qinglin Liang, Haige Xiang","doi":"10.1109/WOCN.2006.1666631","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666631","url":null,"abstract":"Noncoherent receivers are attractive for pulsed UWB systems due to the implementation simplicity. In this paper, a noncoherent receiver structure with an integration optimization scheme of multiple sub-intervals selection is proposed to alleviate the noise effect in detecting UWB-PPM signals. Based on the derivation and modification of the BER performance closed-form expression of the conventional noncoherent receiver, the optimization algorithm is presented and verified numerically, the corresponding receiver presents obvious enhancement to the conventional noncoherent receiver, and in sparse multipath channels even outperforms those with conventional integration optimization of single-interval constraint","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131601741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis and evaluation of various optical waveguide grating couplers for integrated optics 集成光学中各种光波导光栅耦合器的分析与评价
2006 IFIP International Conference on Wireless and Optical Communications Networks Pub Date : 2006-08-07 DOI: 10.1109/WOCN.2006.1666667
S. Ponmalar, S. Sundaravadivelu, L. Suresh
{"title":"Analysis and evaluation of various optical waveguide grating couplers for integrated optics","authors":"S. Ponmalar, S. Sundaravadivelu, L. Suresh","doi":"10.1109/WOCN.2006.1666667","DOIUrl":"https://doi.org/10.1109/WOCN.2006.1666667","url":null,"abstract":"The photonic integrated circuits can be designed by analyzing optical waveguide structures with different types of gratings. The periodic coupling is analyzed for these waveguide structures using coupled mode theory, for both phase matched and non-phase matched conditions. The variations of coupling lengths based on refractive indices differences, operating wavelengths and separation between waveguides are analyzed and obtained the results. The difficulties of integrating the available optical components, which are in all fiber form, in photonic integrated circuits are conquered by these couplers. Integrated optics provides a solution to integrating these components on a single substrate, which miniaturizes the component. By analyzing different waveguide structures, components like optical couplers, wavelength filters, power dividers, polarization transformers etc. can be designed. This paper proposes rectangular, triangular and sinusoidal ridge waveguide structures that act as optical couplers, which provide better coupling efficiency","PeriodicalId":275012,"journal":{"name":"2006 IFIP International Conference on Wireless and Optical Communications Networks","volume":"31 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120995822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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